CN109667823B - Insert and insulating and isolating unit - Google Patents

Abstract

The invention relates to an insert and an insulating and isolating unit. Wherein the insert is adapted to be inserted into the inner bore of the insulating substrate, the insert comprising: a body having a bore, the body having a longitudinal direction and a transverse direction perpendicular to each other and having a first end and a second end spaced apart in the longitudinal direction, wherein the first end is configured to be inserted into the bore of the insulating substrate prior to the second end; and a plurality of teeth extending from the body, wherein each tooth has an engagement end engaged to the body and a free end extending toward the second end of the body; wherein the insert is an integrally formed piece of metal, the thickness of each tooth in the longitudinal direction being designed to allow the free end of the tooth to swing about the engagement end in a direction closer to the body to reduce the dimension of the insert in the transverse direction and to allow the free end of the tooth to swing about the engagement end in a direction away from the body to increase the dimension of the insert in the transverse direction.

Description

Insert and insulating and isolating unit

Technical Field

The invention relates to the technical field of plastic rubber embedding, in particular to an embedded part and an insulating isolation unit.

Background

Currently, coating a layer of insulating material on the outside of a metal nut, for example, of stainless steel or copper material, by a 3D printing process or an injection molding process to manufacture an insulating spacer element, is a routine choice for many industries. In these processes, an insulating material (e.g., resin or rubber) is melted and cast on the outer periphery of the metal nut so that the flowing insulating material can be embedded in a gap, step, or the like receiving structure formed on the outer periphery of the metal nut, and then after the insulating material is cooled, a base material made of the insulating material can be firmly joined with the metal nut covered therewith; or the metal nut is wrapped by the insulation material accumulated layer by layer to form the insulation isolation element.

In addition to the above process, the metal nut may be hot pressed into a hole reserved in the base material after the base material is molded. For example, chinese patent application "insert nut having an internal threaded hole and a plurality of external knurled portions and fastening unit including the same and process cartridge using the fastening unit" published on 2/9/2015 and publication No. CN104879368A discloses a method of inserting a metal nut into a resin base material by shrink fitting. Under the shrink fit, the resin can flow into the gaps of the respective knurled sections themselves and the recesses between the different knurled sections, so that the insert nut and the resin base material are fixedly fitted after cooling.

Such insert nuts can present problems when assembled with the substrate, for example, the substrate or the material forming the substrate must be maintained in its molten state throughout the assembly process. It may not be difficult to maintain the melt temperature during the injection molding process, but the requirement that the substrate be in a molten state while maintaining a given configuration during the pressing of the insert nut into the molding substrate to achieve engagement with the insert nut increases the difficulty and complexity of assembly. Furthermore, the 3D printing and injection molding processes (especially rubber injection molding processes) themselves typically require a long time, and these processes in turn require that the insulating material be cast/wrapped around the insert nut after the insert nut is finished and positioned within the mold or in place, resulting in a lengthy manufacturing cycle for the assembly as a whole. Furthermore, in the 3D printing and injection molding process, in addition to the properties and parameters of the substrate, the properties and parameters of the embedded nut and the assembly relationship between the embedded nut and the substrate are considered in the design stage of the mold or the product, which increases the design difficulty and cost, and in order to match with the standard embedded nut processing, the insulating substrate of the embedded nut has to be specially designed and improved, which in turn increases the restriction conditions for the use of the embedded nut and reduces the flexibility of the application thereof.

Accordingly, there is a need in the industry for an improved process for incorporating an insert nut or insert into a substrate to form an insulating spacer material.

Disclosure of Invention

The present invention aims to provide an insert which can be cold pressed into an insulating substrate.

The present invention also aims to provide an insulating and isolating unit applying the improved insert described above.

According to one aspect of the present invention, there is provided an insert adapted to be embedded in a bore of an insulating substrate, the insert comprising: a body having a bore, the body having a longitudinal direction and a transverse direction perpendicular to each other and having a first end and a second end spaced apart in the longitudinal direction, wherein the first end is configured to be inserted into the bore of the insulating substrate prior to the second end; and a plurality of teeth extending from the body, wherein each tooth has an engagement end engaged to the body and a free end extending toward the second end of the body; wherein the insert is an integrally formed piece of metal, the thickness of each tooth in the longitudinal direction being designed to allow the free end of the tooth to swing about the engagement end in a direction closer to the body to reduce the dimension of the insert in the transverse direction and to allow the free end of the tooth to swing about the engagement end in a direction away from the body to increase the dimension of the insert in the transverse direction.

By designing the thickness of the teeth in the longitudinal direction to be sufficiently small, it is possible to achieve a swinging movement of the teeth about their engaging ends, so that when the insert is inserted into the insulating base material, the teeth can be gathered to reduce the frictional resistance between the teeth and the insulating base material during insertion. And when the pulling force is applied to the embedded part, the teeth can be opened so as to increase the frictional resistance between the embedded part and the insulating base material and effectively prevent the embedded part from being pulled out of the insulating base material. An insert with such teeth can be assembled into the insulating substrate in a cold press fit, thereby simplifying the assembly process. And the insert can be assembled after being finished independently of the insulating base material, so that waiting time is saved. In addition, the embedded part can be made into a non-standard part according to the requirement so as to adapt to different use conditions, and the application range of the embedded part is wider and more flexible.

Preferably, each tooth has a first side facing the first end of the body and a second side facing the second end of the body, the teeth each being configured such that at the end of oscillation of the free end of the tooth in a direction towards the body, there is a gap between the free end of the tooth and the outer surface of the body or the first side of another tooth adjacent and closer to the second end of the body. Thus avoiding that the teeth after being completely folded can not be smoothly unfolded again.

Preferably, each tooth further has a third side facing the second end of the body and inclined relative to the first and second sides, the third side intersecting the first and second sides at opposite ends thereof, respectively, wherein the third side and the first side together define a free end of the tooth, and at the end of oscillation of the free end of the tooth in a direction towards the body, a gap exists between at least the third side of the tooth and the outer surface of the body or the first side of another tooth adjacent and closer to the second end of the body. This provides a simple method of forming the gap.

Preferably, the second flank of the tooth abuts against the outer surface of the body or against the first flank of the further tooth in the event that the oscillation of the free end of the tooth ends in a direction towards the body and there is a gap between the third flank of the tooth and the outer surface of the body or the first flank of the further tooth. Compared with the condition that the second side face of the tooth is not attached to the outer surface of the main body or attached to the first side face of the other tooth, the attached tooth can bring smaller transverse size of the folded tooth to the embedded part, and the embedded part is prevented from propping the insulating base material.

Preferably, the plurality of teeth comprises a first series of teeth arranged along the longitudinal direction.

Preferably, all teeth in the first sequence of teeth are aligned in the longitudinal direction.

Preferably, the engagement end of one tooth in the first series of teeth is next to the engagement end of another adjacent tooth.

Preferably, the plurality of teeth includes a second series of teeth arranged along a circumference of the body, each tooth of the second series of teeth being spaced apart from each other to form a groove therebetween. The inner hole of the insulating base material for inserting the insert may be provided with a protrusion corresponding to the groove, and when the insert having been inserted into the insulating base material receives a torsional force, the groove and the protrusion cooperate to resist the torsional force, thereby preventing the insert from rotating in the insulating base material.

Preferably, all of the teeth in the second sequence of teeth are aligned in the circumferential direction of the body.

According to another aspect of the present invention, there is also provided an insulation isolation unit, including: an insulating substrate having an inner bore; and an insert member inserted into the inner hole of the insulating base material in a friction fit manner; wherein the insert is the aforementioned insert.

Preferably, the insulating and isolating unit is formed by cold pressing the insert into the inner bore of the insulating base material.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the invention.

Drawings

Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a perspective view of an insert according to an embodiment of the present invention;

FIG. 2 is an enlarged view at A of FIG. 1;

FIG. 3 is a front view of an insert according to an embodiment of the present invention;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a schematic view of an insert according to an embodiment of the present invention pressed into an insulating substrate, wherein the insert has not yet been bonded to the insulating substrate;

FIG. 6 is a schematic view of two inserts according to an embodiment of the present invention pressed into the same insulating substrate, wherein the two inserts have not yet been bonded to the insulating substrate;

FIG. 7 is a schematic view of an insulating isolation unit according to an embodiment of the present invention;

FIG. 8 is a schematic view of another perspective of an insulating isolation unit according to an embodiment of the present invention;

FIG. 9 schematically illustrates two states of a tooth after an insert is embedded in an insulating substrate according to an embodiment of the invention; and

FIG. 10 is a schematic view of an insert according to another embodiment of the present invention.

Detailed Description

Referring now to the drawings, illustrative versions of the disclosed insert will be described in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Fig. 1-4 schematically show an insert according to a first embodiment of the invention, which is designated in its entirety by reference numeral 1. The insert 1 is made of a metal material, which may be selected from stainless steel, copper or other suitable conductive material, by an integral molding process. The insert 1 is intended to be press-fitted into a prepared bore 20 of an insulating substrate 2 (shown in fig. 5-10) to form an insulating and isolating unit 6 (shown in fig. 7 and 8). The insulating substrate 2 may be made of an insulating material as a whole, or may be made of an insulating material only in a portion surrounding the insert 1, as long as the electrical conduction of the insert 1 can be isolated. The insulating material may be, for example, rubber, plastic, resin, or other suitable insulating material.

The insert 1 according to the invention is described in detail below with reference to the figures.

As shown in fig. 1 to 4, the insert 1 includes a body 3 in the form of a cylinder and a plurality of teeth 4 integrally formed on an outer surface of the body 3. The body 3 has a longitudinal direction X (or, in the case of a cylinder, also axial) and a transverse direction Y (or, in the case of a cylinder, also radial) perpendicular to the longitudinal direction X. Of course, a cylinder is just one form of the body 3, and in fact the cross section of the body 3 may be of any suitable shape, besides circular, it may also be oval, regular or irregular polygonal, etc., while the cross section of the body 3 at different positions in the longitudinal direction X may be the same or different. The body 3 has two ends spaced apart in the longitudinal direction X, a first end 32 and a second end 34 respectively. The first end 32 is formed in the illustrated embodiment for ease of insertion in a configuration that tapers in cross-section in the longitudinal direction X in a direction away from the second end 34. It will be appreciated by those skilled in the art that even as a first inserted end into the insulating substrate 2 prior to the second end 34, the first end 32 does not necessarily form a tapered configuration but may be a constant cross-sectional configuration.

Although not shown, the second end 34 of the body 3 may form a radially projecting boss for forming a stop fit with the end face of the insulating base material 2, preventing the insert 1 from being inserted into the insulating base material 2 beyond a desired depth.

The body 3 has an internal bore 30, which bore 30 may be internally threaded to engage a screw or spindle having a mating external thread. Alternatively, the bore 30 may be a smooth bore and receive the rod in a tight/friction fit. The cross-section of the bore 30 may be circular as shown, or may be other shapes, such as elliptical, regular or irregular polygonal, etc.

Each tooth 4 extends from the outer peripheral surface of the body 3. One end 40 of the tooth 4 is engaged as an engaging end on the main body 3, and the other end 42 of the tooth 4 opposite to the engaging end 40 is formed as a free end. As shown, the free end 42 extends towards the second end 34 of the body 3 such that each tooth 4 is substantially formed as an inverted tooth directed towards the second end 34 of the body 3.

As shown, each tooth 4 has a thickness defined in the longitudinal direction X which, in the present invention, is so small that the tooth 4 is formed to simultaneously satisfy the condition, firstly, allowing the free end 42 of the tooth 4 to oscillate about the engaging end 40 of the tooth 4 in a direction close to the second end 34 of the body 3 to gradually gather the tooth 4. During the retraction of the teeth 4, the insert 1 is progressively reduced in size in the transverse direction Y and, at the end of the oscillation of the free end 34, the teeth 4 are retracted into position. Second, the free end 42 of the tooth 4 is allowed to swing about the engagement end 40 of the tooth 4 in a direction away from the second end 34 of the body 3 to splay the tooth 4 towards the second end 34. During the spreading apart of the teeth 4, the insert 1 will gradually increase in size in the transverse direction Y and, when the oscillation of the free end 34 is over, the teeth 4 spread apart into position. The convergence of the teeth 4 helps to insert the insert 4 smoothly into the insulating base material 2, while the divergence of the teeth 4 helps to prevent the insert 1 from being pulled out of the insulating base material 2. In the case of teeth 4 or insulating base material 2 made of different materials, the thickness of the teeth 4 may vary, but in any event, the thickness of the teeth 4 needs to be designed to enable the teeth 4 to be folded and unfolded as described above in accordance with the teachings of the present invention.

In the embodiment illustrated in fig. 1-4, the teeth 4 are of polyhedral structure, comprising a first side 44 facing the first end 32 of the body 3 and a second side 46 facing the second end 34 of the body 3 (shown in connection with fig. 2). The longitudinal distance between the first side 44 and the second side 46, i.e. said thickness of the tooth 4, tapers in the direction from the engagement end 40 to the free end 42. At the free end 43, the first side 44 may intersect the second side 46 to define a sharp corner, or, as shown by the ring of teeth 4 closest to the second end 34 of the body 3, a circumferential surface may be connected between the first side 44 and the second side 46 extending substantially in the longitudinal direction X. Although the longitudinal thickness of each tooth 4 is shown as tapering in a direction from the engaging end 40 to the free end 42, this is not required and in other embodiments the longitudinal thickness may be constant in a direction from the engaging end 40 to the free end 42.

Furthermore, in other embodiments, the teeth may also be, for example, tapered or frustoconical, in which case the "first side of the teeth" should be understood as the part of the surface of the tapered or frustoconical tooth that faces the first end of the body, and the "second side of the teeth" should be understood as the part of the surface of the tapered or frustoconical tooth that faces the second end of the body. There may be no distinct demarcation or configuration between such first and second sides.

In the illustrated embodiment, when collapsed into position, the second flank 46 of one tooth 4 may abut substantially without clearance against the first flank 44 of another tooth 4 adjacent and closer to the second end 34 of the body 3, such that the free end 42 of this one tooth 4 abuts against the other tooth 4. In embodiments in which two longitudinally adjacent teeth 4 are spaced or offset from each other, the second side 46 of one tooth 4 may also rest substantially without play against the outer surface of the body 3.

In other embodiments, when collapsed into position, the second side 46 of one tooth may abut the first side 44 of another tooth 4 adjacent and closer to the second end 34 of the body 3, but with a gap between the free end 42 of the one tooth 4 and the first side 44 of the other tooth 4. This helps the teeth 4 to spread apart smoothly after they have been gathered.

Such clearance may be achieved by any suitable means. For example, in the embodiment shown in fig. 10, a third side 48 is also connected between the first 44 and second 46 sides of the teeth 4, which third side 48 is inclined with respect to the first 44 and second 46 sides and faces the second end 34 of the body 3. The third side 48 defines, together with the first side 44, the free end 42 of the tooth 4. As shown in fig. 10, in the same tooth 4, the third flank 48 forms an angle α with the transverse plane that is smaller than the angle β formed by the second flank 46 with the transverse plane. When one tooth 4 is collapsed into position, its second flank 46 can abut against the first flank 44 of the other tooth 4 in a substantially gapless manner, while the third flank 48 of this tooth 4 will be inclined with respect to the first flank 44 of the other tooth 4, so that the aforementioned gap is formed.

In the illustrated embodiment, third side 48 intersects second side 46 and forms a distinct intersection line at the intersection. In yet another embodiment, not shown, the third side 48 may extend smoothly from the second side 46, such as by way of a radiused transition surface formed therebetween.

Alternatively, in yet another embodiment, the third side 48 is omitted and the gap is achieved by a rib/protrusion on the second side 46. When collapsed into position, the second side 46 of one tooth 4 cannot abut the first side 44 of the other tooth 4 due to the presence of the rib/projection, thereby creating a gap between the free end 42 of the one tooth 4 and the first side 44 of the other tooth 4. The ridge/protrusion may also be formed on the first side 44 of a tooth 4 in an alternative embodiment, thereby preventing the second side 46 of other teeth 4 from resting thereon. In the embodiment of forming the ribs/protrusions, it is noted that the inner aperture 20 of the insulating base material 2 is carefully sized to fit because the second side 46 of one tooth 4 does not abut the first side 44 of another tooth 4, so that the insert 1 may still have a relatively large lateral dimension even after the teeth 4 are brought together into position.

The third side 48 and the ribs/protrusions described above are also applicable to embodiments where two longitudinally adjacent teeth 4 are spaced apart or offset from each other such that the second side 46 of the teeth 4 abuts the outer surface of the body 3. In this case, a gap is formed between the third side 48 of the tooth 4 and the outer surface of the body 3, or (in the absence of the third side 48) between the second side 46 of the tooth 4 and the outer surface of the body 3.

In the embodiment shown in the figures, all the teeth 4 are arranged neatly on the periphery of the body 3. These teeth 4 may be divided into a plurality of longitudinal tooth sequences arranged at intervals around the circumference of the body 3, or a plurality of circumferential tooth sequences arranged along the longitudinal direction X of the body 3. A longitudinal tooth sequence is schematically indicated in fig. 3 by an imaginary frame P. In the embodiment shown, all the teeth 4 in the longitudinal series are arranged substantially aligned in the longitudinal direction X, and the engaging ends 40 of two adjacent teeth 4 are next to each other. However, it will be appreciated by those skilled in the art that all teeth 4 in a longitudinal series of teeth may not be aligned in the longitudinal direction X, or two longitudinally adjacent teeth 4 may be offset from each other. Alternatively, the engaging ends 40 of two teeth 4 that are longitudinally adjacent may not be next to each other, but may be spaced apart from each other.

Fig. 3 also shows a circumferential tooth sequence schematically in another imaginary frame Q. Since fig. 3 is a plan view, only a part of the teeth of the circumferential series of teeth is shown in the imaginary frame Q. In the embodiment shown, all the teeth 4 in the circumferential series are arranged substantially aligned in the circumferential direction of the body 3, with a spacing between two adjacent teeth 4, so as to define a groove 5 between these two teeth 4. The recesses 5 help to resist torsional forces applied to the insert 1 in cooperation with the protrusions 22 formed in the inner bore 20 of the insulating base material 2 after the insert 1 has been inserted into the insulating base material 2. As shown, the groove 5 may extend substantially continuously in the longitudinal direction X through all circumferential tooth sequences, thereby contributing to an increased resistance of the insert 1 against torsional forces. Alternatively, in other embodiments, the groove 5 may extend discontinuously in the longitudinal direction X, for example when a tooth in one circumferential series of teeth is offset from a tooth in another adjacent circumferential series of teeth, for example when a tooth in one circumferential series of teeth is located between two immediately adjacent teeth in another adjacent circumferential series of teeth, the groove defined between the two immediately adjacent teeth may end in the longitudinal direction X with the one immediately adjacent tooth.

Furthermore, other forms of tooth arrangement will occur to those skilled in the art, such as forming a series of slanted teeth that are inclined with respect to the longitudinal direction X, or forming a series of helical teeth that spiral on the outer surface of the body, or forming no series of teeth in any form, but rather having the teeth arranged in a discrete fashion, etc.

The shape and size of each tooth 4 may also vary, where the shape relates to the cross-sectional shape and the longitudinal cross-sectional shape, and the size relates to the thickness of the tooth in the longitudinal direction X, the width of the tooth in the circumferential direction of the body, the length of the free end of the tooth to the engaging end, the angle of the tooth in the collapsed and expanded state, etc. These parameters can be selected according to actual needs, and are not necessarily uniform.

Fig. 7 and 8 show a schematic view of an insulating and isolating unit formed after the insertion of the aforementioned insert 1 into the insulating substrate 2, which is designated as a whole by the reference numeral 6. Fig. 5 and 6, in turn, show a schematic view of the insert 1 about to be inserted into the insulating substrate 2, wherein the arrows in the figure represent the pressing direction of the insert 1 into the insulating substrate 2. The pressing-in of the insert 1 is a cold press fit, i.e. without the insulating base material 2 having to be in a molten state during the assembly of the entire insulating and isolating unit 6, the insulating base material 2 is cooled, which is an advantage given by the fact that the teeth 4 of the insert 1 are designed to be small enough in thickness to enable a certain range of oscillation thereof. The insert 1 is aligned with the inner bore 20 of the insulating substrate 2 with the first end 32 closer to the inner bore 20. Pressure is then applied to the insert 1 in the direction of the arrow so that the first end 32 is inserted into the bore 20 and then the second end 34 is inserted into the bore 20. During insertion, the free end 42 of each tooth 4 of the insert 1 rubs against the wall of the bore 20 so that the teeth 4 swing into a collapsed condition. This collapsed state is drawn in a schematic manner in side B of fig. 9. The teeth 4, which are directed toward the second end 34 of the body 3 and converge, allow the insertion process to be very smooth, effectively reducing frictional resistance. After the insert 1 is inserted into position, the insert 1 and the insulating base material 2 together form an insulating and isolating unit 6. Once the screw or nut or other type of rod inserted in the internal bore 30 of the insert 1 is subjected to a drawing force in the opposite direction to the aforementioned pressure, the teeth 4 of the insert 1 open by friction of their free ends 42 against the wall of the internal bore 20 of the insulating base material 2, thus preventing the insert 1 from being extracted. This expanded state is drawn in a schematic manner in side a of fig. 9. When a screw or nut or other type of rod inserted into the inner bore 30 of the insert 1 is subjected to a torsional force, the recess 5 of the insert 1 cooperates with the protrusion 22 in the inner bore 20 of the insulating base material 2 to resist such torsional force.

It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.

Claims (8)

1. An insert adapted to be inserted into an internal bore of an insulating substrate, the insert comprising:

a body having a bore, the body having a longitudinal direction and a transverse direction perpendicular to each other and having a first end and a second end spaced apart in the longitudinal direction, wherein the first end is configured to be inserted into the bore of the insulating substrate prior to the second end; and

a plurality of teeth extending from the body, wherein each tooth has an engagement end engaged to the body and a free end extending toward the second end of the body;

wherein the insert is a one-piece metal member, the thickness of each tooth in the longitudinal direction being designed to allow the free end of the tooth to swing about the engagement end in a direction closer to the body to reduce the dimension of the insert in the transverse direction and to allow the free end of the tooth to swing about the engagement end in a direction away from the body to increase the dimension of the insert in the transverse direction;

wherein each tooth has a first side facing the first end of the body and a second side facing the second end of the body, the teeth each being configured such that at the end of oscillation of the free end of the tooth in a direction towards the body, there is a gap between the free end of the tooth and the outer surface of the body or the first side of another tooth adjacent and closer to the second end of the body;

each tooth further has a third side facing the second end of the body and inclined with respect to the first and second sides, the third side intersecting the first and second sides at opposite ends thereof, respectively, wherein the third side and the first side together define a free end of the tooth, at the end of oscillation of the free end of the tooth in a direction towards the body, there is a gap between at least the third side of the tooth and the outer surface of the body or the first side of another tooth adjacent and closer to the second end of the body, the second side of the tooth bearing against the outer surface of the body or against the first side of the other tooth.

2. The insert of claim 1, wherein the plurality of teeth comprises a first series of teeth arranged along the longitudinal direction.

3. The insert of claim 2, wherein all of the teeth in the first sequence of teeth are aligned along the longitudinal direction.

4. The insert of claim 2, wherein the engagement end of one tooth in the first series of teeth is next to the engagement end of another adjacent tooth.

5. The insert of claim 1, wherein the plurality of teeth includes a second series of teeth arranged along a circumference of the body, each tooth of the second series of teeth being spaced apart from one another to form a groove therebetween.

6. The insert of claim 5, wherein all of the teeth in the second sequence of teeth are aligned in a circumferential direction of the body.

7. An insulated isolation unit comprising:

an insulating substrate having an inner bore; and

an insert member frictionally inserted into the inner bore of the insulating base material;

characterized in that the insert is an insert according to any one of claims 1 to 6.

8. The insulating and isolating unit of claim 7, wherein said insulating and isolating unit is formed by cold pressing said insert into an inner bore of said insulating base material.

Images